Rotary cylinder pump



June 29, 1948. s, Q STAGEBERG 2,444,234

ROTARY CYLINDER PUMP Filed June 28, 1943 V 2 Sheets-Sheet 1 InventorSterling O. stageberg e9. M o w 18 68 5/ 1 Attor ne s June 29,1948. s.O..$TAGEBERG 2,444,234

ROTARY CYLINDER PUMP Filed June 28, 1945 4 Sheets-Sheet 2 Iii-2' 4Inventor Sterling O. Stageb g wlfigw Attornegs attached attheir-extremities to said Patented June 29, 1948 umrso STATES PATENTOFFICE ROTARY. CYLINDER mm sterling 0. Stageberg, Minneapolis; MinnApplication June as, 1943, serial sq. 492.505

Claims. (Cl. roe-121) An object of the invention resides inproyiding apump having two relatively movable displacement members with facingsurfaces, port-ions of said surfaces beingladapted to approach andremade from .one anotheriupon relative movement .of said members andinrproviding vanes rigidly membersat said surfaces.

Another object of the inventionresides in con- .structingthe vanes fromresilient material.

An object of the invention resides in arranging the yanesin the form ofaloop.

A feature .of the invention resides in utilizing .a {clamp member forsecuring the extremities .of the cranes to the displacement members.

, Another object of the invention resides in constructing the clampmembers with hacking surfaces attached .to engage the vanes and .tolimit the flexu-re of the .vanes adjacent the localities of ttachment ofthe vanes to the displacement members.

A still {further object of the invention. resides in constructing the.pump with aninlet and an .outlet and with .ports communicatingtherewith and shaped to conform to the shape of the .expansible chambersbetween the vanes.

Another object .of the invention resides in providing .a pump having twoliotatabledisplacement members, each rotating in balanced relation aboutits \own axis, the axis .of said displacement members beingnon-coincidental.

Another object of the invention resides in ,pro-

viding driving meanstor driving .one of said .dis-

placement members to cause lqperation of .the other displacement memberthrough the :vanes connected to the displacement members and in furtherproviding transmission means for .preventing reverse relative movementbetween said displacement members to ,preventbucklin of the vanes. I

.A ,ieature of the invention resides in utilizing as said transmission atorsional coil spring con: nected to said displacement member andtwisted to maintain -certain of said vanes .in tension.

Other objects of th invention reside inthe Fig, 2 is an ielevationalsectional view taken on line 2-1-1 of Fig. 1 and drawn to .a somewhatlarger scale. 1 1 Y Fig. ,3 is an enlarged sectional view taken on line,3-.-\3 of Fig. 2and drawn to the same scale as While .I have describedmy invention as ,Ja pump, it is to be understood that the invention mayheembodied in any type of device hav'ingexpansible chambers, such as a,pump, compressor, motor or similar structure and that the word pump,when used in the specification, should he so interpreted My inventioncomprises a case in constructed with .twos'ections .I] and 12. Thesectionjll has a'ci-nciunierential Wall .I'Band a radial well illconnected therewith. Issuing from the radial wall 14 and concentric withthe "circumferential wall I3 is .a tubular boss iii. The section .12xcomprises a radial Waller end plate 16 which overnovel combination andarrangement of parts and in the details of construction hereinafterillustrated and7o'r' described.

"Inthe drawings: Fig. 1 is an elevational View of a p mn w trating anembodiment of my invention.

.lies a flange [1 formed on the circumferential wall I; of section H andwhich is secured thereto by means of cap screws id. The wall 16 hasissuing from it a tubular boss 19 similar to the boss 115.. boss may,beintegral with the :Dlate tor the same may be detachable therefrom asshown in the drawings. In such case, the wall 4 51s constructed with abore i2! which receives the end 22 of the boss 19. A number of screws 23extend'lthrough afiange 24 on the boss 19 and are screwed into the plate}I'B tor holding the said boss attached thereto. 1

Within the interior of the case I'll ,aremounted two displacementmembers 25 and .25 which are mounted tor nelative movementandccnstructed in the following manner. The displacement member 245comprises a shat ,217 which extends through the boss 1L5 andls journaledat its outer end in -.a ball bearing 23 mount ed at the outer end ofsaid boss. ,Thisshaf-t has an enlarged portion ZBe'xtending inwardlyfrom the bearing .28 which, in turn, is iournaled in a ball bearing 13]mountedin an offset 32 in theLboss f5. An oil seal .33 retains theliibrication within the hearing 3| and prevents the same from flowinginto the operating mechanism of theldevice. The displacement memher 215.further includes an end mat s: which has anannulus or ring 35 securedthereto by means of screws 36 which extend through the plate .34 and arethreaded into the ring 35. The ring .35 is concentric with the axis ofthe shaft 21. The shaft .2], through the action of the 'ball bearing 28.and 3]., is guided tor rotational movement about an axis concentricwith that of the ring 35. .Axial movement -.of the said shaft maybeeliminatedby means of nuts in the bearings 42 and 43 is taken up bymeansof a nut 45 screwed upon the end of shaft 4|. The

shaft 4| terminates at the end of the boss [9 which is closed by meansof a cap 46 secured to the extreme end thereof. As will be noted in Fig.

2, the axis of the shaft 4! is eccentric with refsaid ring. The clampmember 64 has a spiraling surface 66 which recedes from the spiralingsurface 53 and which forms a backing surface similar to the backingsurfaces 51 and 58 of the clamp member 53. These surfaces limit flexingof the vanes at the localities of attachment to the displacement membersand thereby increase the life of the vanes,

The eccentricity of the two shafts 21 and 4| is such that the variousvanes 41a, 41b, 410, etc., between the ring 35 and the lowermost clampmember 53 just fill such space. The other portions of said vanes loopoutwardly from the clamp member 53 and form more or less crescent shapedchambers indicated at 67a, 61b, 610, etc. The

' surfaces 59 of the clamp members 53 conform to erence to the axis ofthe shaft 21 but parallel thereto.

Betweenthe hub 39 and the ring 35 are mounted a number of flexible vanes41a, 41b, 41c, etc. Inasmuch as these vanes are identical in construction, and attached to the two displacement members in identicallythe same manner. only the vane 41a and its mode of attachment will bedescribedin detail. The vanes are constructed from flexible materialsuch as rubber impregnated fabric,'leather, flexible metals, or any ofthe rubber substitutes now well known in the art. Applicant has foundthat ordinary rubber belting of suitable thickness and rigidity willserve the purpose. The vane 41a is constructed as a ribbon and extendsspirally between the hub 39 andthe ring 35. The said vane is looped asdesignated at 48' and. the two extremities 49 and 55 of-said vane extendin the same rotational direction, namely, counter-clockwise, as viewedin Fig. 3. "The hub 39 is polygonal inform, having a number of flatsides 52a, 52b, 520, etc., one for each of the vanes 41a, 41b, 410, etc.In the instant exemplification 'of the invention, there are eight vanesand, accordinglyjthe hub 39 is constructedwith eight sides 52a, 52b,520, etc.

The extremity 49 of the vane 41a overlies the sur- I face 52a of hub 39and is secured thereto by means of a' clamp member 53. This member hasa'fiat surface 54j overlying the extremity 49 of vane 41a and is boltedto the hub 39 by means of a bolt 55 shown in Fig. 2. Dowel pins56 whichextend through said clamp member and into the hub 39 retain the clampmember in proper position upon the hub. The clamp member 53 isconstructed with a slightly convex curved outer'surface 51, a highlyconvex curved surface 58 at one end thereof merged into'the surface 51and a concave surface 59 at the other end thereof. The clamp member 53,in addition to holding the end of the vane 41 in position, serves as abackin member and the surfaces 51 and 58 .form backing surfaces for theportion of the vane 41 adjacent the extremity 49, so that when the vane41a is in the position of the Ivane He, said portions of the vane extendalong said surfaces and are restrained from further flexure thereby.

The pposite extremity 5! of the vane 41a is attached to the ring 35. Forthispurposa'the said ringis constructed with a number of recesses Bic,6lb,6lc, etc., which have radial ends '62 and spiraling surfaces 63connected therewith' The extremity 5 l of the vane 41a lies in therecess 6 la and is attached to the ring at such locality by means of aclamp member 64 A number of screws 65 extend through the ring 35 and arethreaded into said clamp member, thus securely attaching the extremity5| of the vanefla to the the formof the loops 48 of the adjacent vanes41a, 411), etc., when in their most extended positions and help reducethe volume of the chambers 51a, 511 etc., to a minimum when the vanesare collapsed.

Communicating with the various chambers 61a, 67b;'5lc,'etc., is an inlet68 and an outlet 69. Crescent shaped ports H and 12in the end plate l5directly communicate with these chambers and also with said inlet andoutlet.

In the shaft 21 and'in the'enlarged portion 29 thereof is formed aconical bore I3 shown in Fig. 2. A torsional coil spring 14 is disposedwithin this bore and within another bore I5 in the facing portion of thehub 39. This spring has secured to the ends of it-bushings 16 which arescrewed into the shaft 2? and the hub 39 at the ends of the bores 13 and15, respectively. Prior to the assembly of the vanes 41a, 41b, 410,etc., the spring 14 is tensioned by rotating the two displacementmembers 25 and 26 relative to one another and twistin said spring. Thesaid members are then so hold during assembly. After assembly, saidmembers are released and the spring 14 acts to tension the vanes andprevent buckling thereof during operation of the pump.

The operation of the invention is as follows: The hub 39 of displacementmember 26 and the vanes 41a; 41b, 47c, etc., fit snugly between thefacing surfaces 18 and 19 of the two plates or Walls '34 and I6; Aslight amount of clearance is provided, so that friction is minimizedand the necessity for lubricationat these localities is eliminated. 1 InFig. 3, it will be noted that the chambers 61a, 61b, 610, etc., while atthe uppermost portion of the device, have a'greater capacity than at thelowermost portion of the device and that the capacity. increases fromthe bottom to the top and decreases from the top to the bottom, The port12 communicates with said chambers while the same decrease in volume andreceives the contents of saidchambers. The port H communicates with saidchambers while the same are increasing in volume and directs the fluidto be pumped into the same. In this manner, the rotation of the twodisplacement members-25 and 26 causes pumping action, drawing the fluidinto inlet 68 and discharging it from outlet 69. In the operation of thepump, the displacement member 26 is driven by the displacement member25'through the various vanes 41a, 41b, 410, etc. It will be 'noted'tha'tthe driving is effected through the vanes when they occupy positionssimilar to that of the vane 41d in the drawings. When the pump is inoperation, the pressure within the various chambers and. the tension onthe vanes exerted tl'n'ough the driving of the memberjfi by the member25 causes ,the vanes to assume positions similar to those shown in Fig.3.

cheese;

inu-nngoperauon of the u p; the vanes follow along the su aces 58 and ior t a p m mbers tvlyalong the ,surface fifi of clamp members 64 andalong the surfaces 6'3 of the ring 35 which prevent undue flexing of thevanes at their-localities of attachment and givelong "life'to the vanes.The spring 'Hl restraint reverse relative move,- ment of thedisplacement membersrelative to one another and prevents buckling ofthe'van'esl "Theadvantages of the invention are manifest. No'lubricationis needed for "the movable parts forming the 'expansible chambers. Thebearings forth shafts can be packed with lubricant and will not needattention; The-pump has no valves. Agreat capacity for the size of thepump can be procured. By rotating both displacement members, each arerotated about itsown axis and bal- ,anced so that undue vibration iseliminated. Due to the backing surfaces at thelocality of attach ment ofthe vanes tothe displacement members, undue bendingis prevented and longlife is the result. The pump is quiet in operation and does notget-noisyin use. There a minimum'amount of'gfr ictionin the pump, so that fortheparticular type of pump, a maximum efficiency is procured. Changes inthe specific 'form of my invention, as herein described, maybe madewithin the scope ofwhat is claimed without departing from the spirit ofmy 'invention. Having described my invention, what I claim as new anddesire 'to protect by Letters Patent is: 1, In combination, two"relatively movable displacement members, said members having racingsurfaces, portions of said surfaces being adapted to approach and recedefrom one another upon relative movement of said members, a plurality offlexible vanes-extending between said surfaces, clamp members engagingsaid vanes at their extremities and ach secured to one of said,displacement members 'ior rigidly attaching said vanes to-saiddisplacement members, said clamp members having surfaces receding fromthe surfaoes of the adjoining structure to form flaring recesses for thereception of said vanes, said vanes having free edgesintermediate the1ocalities of attachment tosaid members, Walls having surfaces alongwhich the free edges of said vanes move, said walls and vanes forming aplurality of expansible chambers and an inlet and an outlet successivelycommunicating with said chambers upon relative movement of said displacement members.

2. In combination, two relatively movable displacement members, saidmembers having facing surfaces, portionsof said surfaces being adaptedto :approach and recede from i one another upon relative movement .ofsaid members, a plurality ofwanes means for immovably attachingat-definite localities an extremity of each of said vanes to one of saidmembers at its denoted surface and the opposite extremities to the otherof said members atits denoted surf-aceysaid vanes beingeformed with-.free edges intermediate the localities of at tachment to said members,said vanes being flexible throughout their extent and bending in adirection extending from one locality of attachment to the other, meansat the localities of attachment of the vanes to one of said displacementmembers and having surfaces extending up to the localities of attachmentfor limiting the degree of curvature of said vanes beyond suchlocalities, walls having surfaces along Which the free edges of saidvanes move, said walls and vanes forming a plurality of expansiblechambers and an inlet and an outlet successively communicatingwithsa-id' chambers upon relative move ment of said displacementinembers.

3. In combination, two -r elatively movable displacement members, saidmembers having facing surfaces, portions of said surfaces being adaptedto approach and recede from one another-upon relative movement of saidmembers, a plurality of vanes, means for immovably attaching at definitelocalities an extremity 'of .eachof saidvanes to one of said members atits denoted surface and the opposite extremities .of said vanes to theother of said members at-saidsurfaces andbeirig formed with freeedgesdritermediate the Ionianties of attachment to said members, saidvanes being flexible throughout their extent and bending in a directionextending from one locality of attachment to the other, and meansproviding backing surfaces extendingto the localities of attachment ofthe vanes to oneof said displace"- ment members to prevent abruptbending of the vanesat such localities, walls having surfaces alongwhich the free edges of said vanes move, said wallsand vanes forming apluralityofexpansible chambers and an inlet and an outlet successivelycommunicating with said chambers upon relative movement of saiddisplacement members.

4. In combination, two displacement members having facing surfaces,means for guiding said members for rotation about difierent 1axes, ftocause portions of said surfaces to approach recede from one another,means fordriving one of saidmembers, a plurality f flexible vanesrigidly attached at opposite extre ities to said members at saidsurfaces, saidvanes serving to drive the second'displacement member fromthe driven displacement member in the same direc tion of rotation,yieldab'lemeans for ,restrai ng reverse re lvativerotational movementbetween fald displacement members, said vanes having free edgesintermediate the localities of attachment-to said members, walls havingsurfaces along which the free edges of said vanes move, saidwalls andvanes forming a plurality of expansible chambers and an inlet and anoutlet successively coinmunicating with said chambers 11150 1 relativemovement of said displacement members.

5. In combination, two displacement members having facing surfaces,means forguiding said members for rotation about different axes/to causeportions of said surfaces to approach and recede from one another, meansfor driving one of said members, a plurality of flexible vanes rigidlyattached at opposite extremities to saidmem bers at said surfaces, saidvanes serving to drive the second displacement member from the drivendisplacement member in the same direction of rotation, a torsional coilspring actin between said members for restraining reverse relative rotational movement between said displacement members, said vanes havingfree edges intermediate the localities of attachmentto said members,walls having surfaces along which the free edges of said vanesmoveQQsaid walls and vanes forming a plurality of expansible chambersand an inlet and an outlet successively communicating with said chambersupon relative movement of said displacement members.

6. In combination, a displacement member having a cylinder, a seconddisplacement member having a hub received within said cylinder, means:for guiding said members for rotation about spaced axes, eachconcentric with one of said members, a plurality of looped flexiblevanes rigidly attached at opposite extremities to said hub upon theexterior surface thereof and to said and an inlet and an outletsuccessively communicating with said chambers upon relative movement ofsaid displacement members,

'7. In combination, two displacement members having facing surfaces,means for guiding said members for rotation about different axes, to

causeportions of said surfaces to approach and recede from one another,means for driving one of said members, a plurality of flexible vanesrisidly attached at opposite extremities to said members at saidsurfaces, said vanes serving to drive the second displacement memberfrom the driven displacement member in the same direction of rotation, aspring acting between said displacement members for restraining reverserelative rotational movement between said displacement members, saidvanes having free edges intermediate the localities of attachment tosaid members, walls having surfaces along which the free edges of saidvanes move, said walls and vanes forming a plurality of expansiblechambers and an inlet and an outlet successively communicating with saidchambers upon relative movement of said displacement members.

8. In combination, two displacement members having facing surfaces,means for guiding said members for rotation about different axes, to

cause portions of said surfaces to approach and recede from one another,means for driving one of said members, a plurality of flexible vanesrigidly attached at opposite extremities to said members at saidsurfaces, said vanes serving to drive the second displacement memberfrom the driven displacement member in the same direction of rotation,resilient torsional means acting between said members for restrainingreverse relative rotational movement between said displacement members,said vanes having free edges intermediate the localities of attachmentto said members, walls having surfaces along which the free edges ofsaid'vanes move, said walls and vanes forming aplurality of expansiblechambers and. an inlet and an outlet successively communicating withsaid chambers upon relative movement of said displacement members.

9. In combination, two relatively movable displacement members, saidmembers having facing surfaces, portions of said surfaces being adaptedto approach and recede from one another upon relative movement of saidmembers, a plurality of flexible vanes extending between said surfacesand overlying portions of the same, said vanes being curved in theirdirection of extent between said surfaces, clamp members overlying saidvanes at their extremities and clamping said vanes to said members, saidclamp members having-curved surfaces diverging from the denoted surfacesof said displacement members'the curvature of said surfaces of saidclamp members extending in the same general direction as the curvatureof said vanes, said curved surfaces of the clamp members limiting theflexing of the vanes at their 10- cality of attachment to thedisplacement members, said vanes having free edges intermediate thelocalities of attachment to said members, walls having surfaces alongwhich the free edges of said vanes move, said walls and vanesforming aplurality of expansible chambers and an inlet and an outlet successivelycommunicating with said chambers upon relative movement of saiddisplacement members.

10. In combination, two relatively movable displacement members, saidmembers having facing surfaces, portions of-said surfaces being adaptedto approach and recede from one another upon relative movement of'saidmembers, rotary means for procuring such movement between said mem bers,a pluralit of flexible vanes extending between said surfaces, said vanesbeing curved intermediate the localities at which said vanes leave saidmembers, the curvature of said vanes varying during movement of saiddisplacement members, clamps for attaching .the ends of said vanes tosaid surfaces of said displacement members, said clamps being disposedupon the concave surfacesof said vanes and having convex surfaces forengagement with said vanes, said convex surfaces being continuous up tothe locality at which said vanes leave the displacement members anddiverging outwardly therefrom, said vanes having free edges intermediatethe localities of attachment to said members, walls having surfacesalong which the free edges of said vanes move, said walls and vanesforming a plurality of expansible chambers and an inlet and an outletsuccessively communicating with said chambers upon relative movement ofsaid displacement members.

STERLING O. STAGEBERG.

REFERENCES CITED I The following references are of record in the file ofthis patent:

UNITED STATES PATENTS 448,903 Great Britain June 17, 1936

